a. SO3 is sulfur trioxide, not sodium trioxide.
b. There is no oxygen produced. Oxygen is on the reactant side.
c. In gaseous reactions, it isn't necessary to convert to mols. You may use volume directly; i.e., 12.0 L SO3 produced means 6.0 L oxygen were used (if the reaction goes to completion).
d. note the correct spelling of Celsius.

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